As s freshman using python, It’s easy to be confused when copying alist. Here are some methods to make copy fromoriginalListtotargetListwhich are from the blog page,[Python]列表复制的几种方法. they are: # python code # No.1 DON'T USE THIS. targetList = originalList# DON'T USE TH...
Make a copy of a list with the copy() method: thislist = ["apple", "banana", "cherry"]mylist = thislist.copy() print(mylist) Try it Yourself » Use the list() methodAnother way to make a copy is to use the built-in method list().Example...
x = copy.copy(y) # make a shallow copy of y 浅拷贝,只拷贝父对象, 不拷贝父对象里的子对象 x = copy.deepcopy(y) # make a deep copy of y深拷贝,递归拷贝,拷贝对象及其子对象 For module specific errors, copy.Error is raised. The difference between shallow and deep copying is only releva...
While programming in python, we sometimes need to store the same data in multiple places. This may be due to the fact that we need to preserve the original data. In this article, we will discuss different ways to copy a list in python. Table of Contents Copy a List in Python The id(...
Let's say we have a List of Lists. If we make a copy with one of the above methods and change the inner elements, it still affects the other List as well: a=[[1,2],[3,4]]b=a[:]# or:# b = a.copy()# b = list(a)# b = copy.copy(a)b[0].append(99)print(b)# [...
1#python copy2'''3个人认为:4浅拷贝:拷贝后,对象的引用没有发生变化,而对象的行为发生变化,会反映到拷贝后的对象身上5深拷贝:拷贝后,对象的引用发生了变化,即对象不同,所以,即使对象再怎么变,也不会对其他对象产生影响6'''78importcopy910defshallow_copy(s):11'''make a shallow copy of s.'''12retur...
glob()方法返回一个生成器对象(这超出了本书的范围),您需要将它传递给list(),以便在交互式 Shell 中轻松查看: 代码语言:javascript 复制 >>> p = Path('C:/Users/Al/Desktop') >>> p.glob('*') <generator object Path.glob at 0x000002A6E389DED0> >>> list(p.glob('*')) # Make a list ...
Use the following code to track the actual version of the Python functions library in your runtime:Python Copy getattr(azure.functions, '__version__', '< 1.2.1') Runtime system librariesFor a list of preinstalled system libraries in Python worker Docker images, see the following:...
(x,"__reduce__",None)ifreductor:rv=reductor()else:raiseError("un(deep)copyable object of type%s"%cls)ifisinstance(rv,str):y=xelse:y=_reconstruct(x,memo,*rv)# If is its own copy, don't memoize.ifyisnotx:memo[d]=y_keep_alive(x,memo)# Make sure x lives at least as long as...
In other words, we created two separate lists, but each list stores the same exact references. Modifying a reference in one list modifies it in the other list.A deep copy method would make sure to copy both the outer list and the inner list. Keep that in mind as we move forward....